Imperial21 Posted May 18, 2008 Share Posted May 18, 2008 Maybe a silly Q? but is 80W90 about the best to use in the front and rear difs? Is there an additive for posi--Mopar used to call for an additive for SureGrip rear ends--is that still the case for the Dana44 with posi? Also, I don't have a manual, does the tranny/T-case call for autotrans fluid or something heavier? thanks! Brian :Canadaflag: Link to comment Share on other sites More sharing options...
Eagle Posted May 18, 2008 Share Posted May 18, 2008 Jeeps never had "posis". That;s a GM trademark. The Comanches had a Dana-Spicer limited slip called Trac-Lok. It does require an additive, which Jeep calls "friction modifier." It's available from any Mopar dealer. Best gear lube is 75W140 synthetic. That's what Jeep puts in the newer vehicles with tow options. But if you don't do a lot of heavy towing, there's nothing wrong with 80W90. Link to comment Share on other sites More sharing options...
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